A negative pressure thermal desorption treatment system for mercury-contaminated soil

Abstract

A negative pressure thermal desorption treatment system for mercury-contaminated soil, including a pretreatment device, a feeding device, a waste heat utilization heat exchanger, a negative pressure heating device, a soil collection box and an air extraction device; the pretreatment device Crushing and mixing the soil with the catalyst, the feeding device transports the soil from the pretreatment device to the waste heat utilization heat exchanger, the waste heat utilization heat exchanger preheats the soil and makes the soil drop to the negative pressure heating device, the negative pressure heating device Perform thermal desorption treatment on the soil and drop the soil to the soil collection box. The air extraction device extracts the hot air inside the negative pressure heating device to form a negative pressure inside the negative pressure heating device. The air extraction device and the waste heat utilize the intake air of the heat exchanger. The hot air flows into the waste heat utilization heat exchanger to exchange heat with the soil. The air outlet of the waste heat utilization heat exchanger is connected with a cyclone dust collector, a condensation device and an exhaust gas treatment device in sequence, which can safely and efficiently negatively impact the mercury-containing soil. Autoclave desorption treatment.

Description

technical field [0001] The invention relates to the field of mercury-contaminated soil treatment, in particular to a negative-pressure thermal desorption treatment system for mercury-contaminated soil. Background technique [0002] Mercury is a toxic metal that is extremely harmful to ecosystems and human health. In recent years, human activities have released a large amount of mercury, which has caused serious pollution to the atmosphere, water and soil around the mercury discharge area. At present, how to remove mercury pollution in soil efficiently and environmentally friendly is the concern and research of the society. The thermal desorption process is one of the best technologies for treating mercury-contaminated soil, which uses direct or indirect heat exchange heating to bring the contaminated components in the soil to a temperature high enough to evaporate and separate from the soil medium the process of. At present, thermal desorption equipment in the form of rot...

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Problems solved by technology

However, after this heating treatment, the nutrients in the soil will be destroyed, thereby changing the physical and chemical properties of the soil, and the energy consumption is high

In addition, the sealing of the device is poor, and it is easy to leak air in the feeding and discharging unit, which greatly reduces the mercury removal effect and easily causes secondary pollution.

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